Page 41 - Biofuels Refining and Performance

24 Chapter One

2H
O 2 2

Fd Fd
CHLOROPLATS
Light OX Red OX Red

NADPH
NADPH
Reductase Reductase

NADP NADP

Figure 1.8 Concept of a two-stage separated system for pho-
tolytic chamber.

Dibromothymoquinone blocks the natural electron flow system at
plastocyanin level (see Fig. 1.9). Thus, in the presence of an artificial
donor or acceptor, the photo systems I and II can be separated at pre-
and post-blocking points.

H + H +
Q FeS Fd NADPH
PQ (Cyt 559)
II I

(a)
O 2 H O Mn Pcy (b) Ascorbate
2
H + H +
(a) Phenazin methesulphate
(b) Diaminodurol; I and II photosynthesis systems I and II
Figure 1.9 Electron flow system at the plastocyanin level.